Tuesday, May 5, 2009

OSPF routing part X - non broadcast FR

I recently came across a scenario where the requirement was to run OSPF over a frame-relay network. Normally this would represent a straightforward routing configuration. As ever with the CCIE the interesting part was that no broadcast keywords had been placed on the frame-relay map statements, and none were allowed.

If there are no broadcast capabilities on the underlying network this is not necessarily a problem for OSPF as long as a suitable OSPF non-broadcast network type is chosen.

I set the ospf network type to 'non-broadcast' and then 'point-to-multipoint non-broadcast' and these worked fine as long as the required neighbor statement was configured on the hub router.